Which sentence is punctuated correctly?
a. some of the world’s highest waterfalls can be found within: venezuela, south africa, and peru.
b. some of the world’s highest waterfalls can be found in: venezuela, south africa, and peru.
c. some of the world’s highest waterfalls can be found in the countries of: venezuela, south africa, and peru.
d. some of the world’s highest waterfalls can be found in three countries: venezuela, south africa, and peru.